Implement remaining handlers and fix admin login

- Fix admin login bcrypt hash in database migrations
- Add static data handler (GET /api/static_data/, POST /api/static_data/refresh/)
- Add user handler (list users, get user, list profiles in shared residences)
- Add generate tasks report endpoint for residences
- Remove all placeholder handlers from router
- Add seeding documentation to README

New files:
- internal/handlers/static_data_handler.go
- internal/handlers/user_handler.go
- internal/services/user_service.go
- internal/dto/responses/user.go

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

internal/dto/responses/user.go

@@ -0,0 +1,19 @@
+package responses
+
+// UserSummary represents a simplified user response
+type UserSummary struct {
+	ID        uint   `json:"id"`
+	Username  string `json:"username"`
+	Email     string `json:"email"`
+	FirstName string `json:"first_name"`
+	LastName  string `json:"last_name"`
+}
+
+// UserProfileSummary represents a simplified user profile response
+type UserProfileSummary struct {
+	ID             uint   `json:"id"`
+	UserID         uint   `json:"user_id"`
+	Bio            string `json:"bio,omitempty"`
+	ProfilePicture string `json:"profile_picture,omitempty"`
+	PhoneNumber    string `json:"phone_number,omitempty"`
+}